WW2 NZ gold return fobs are very rare, unlike their WW1 equivalents.

ORARI, handcrafted in gold (9ct, 5.0g, 38x26mm), by G. & T. Y. (G. & T. Young), ring top suspension, reverse inscribed 'Service Overseas/Sglmn.T.Burke/2nd N.Z.E.F./1939'. Extremely fine. ex Jim Noble collection

https://www.aucklandmuseum.com/war-memorial/online-cenotaph/record/174854?p=8&n=burke&from=%2Fwar-memorial%2Fonline-cenotaph%2Fsearch&ordinal=144

Depending on timing item may be sent from Australia as we regularly travel between NZ and Australia, if so - note it's a big world out there beyond NZ and Australia post express tracked is probably faster and more reliable than NZ post.